RPN Hello lets you perform in a smart and easy way all of your everyday calculation tasks. Originally written for calculations in RPN style the app is meanwhile capable to run also as DAL Calculator (DAL means Direct Algebraic Logic). You can switch in an instant between RPN (Reversed Polish Notation) and DAL by a triple touch onto the calculator's logo without interrupting the ongoing calculation process. - In App Purchase is now obtainable: To individualize your RPN Hello calculating experience you can choose and install one or more of additional Calculator Designs you would likely prefer to work with. You can find an increasing variety of Calculator Designs in a catalog under the now openable Calculator Case.